My FT707 was a gift from my late father-in-law, Donald W. Behnken, KA1LXO who had used
it on the family boat prior to upgrading to a TS430S.
I have modifed the rig such that the MOX switch is now used to switch in a receive
attenuator. The rig suffers from a design fault whereby the PA goes non-linear when
using SSB off a 12 v supply - it needs at least a 13.0 volt supply to prevent the PA bias
current dropping too low. Since I mainly use QRP CW, this is not a problem for me!
Mode switch problems
Although I have never experienced problems with the mode switch on my rig, Eric Young
G4MZX has reported that he had been given a FT707 where the mode switch had come loose and
ripped off most of the wires. As it did not come with a manual, Eric asked for
extracts from the circuit diagram so that he could reconnect the wires. Wiring of
the four switch wafers is included below (just click on the thumbnails to view).